Air treatment device



FIG. 1 is a perspective view of an air treatment device showing a new design in accordance with our invention;

FIG. 2 is a side view thereof, the opposite side being a mirror image of that shown;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for an air treatment device, as shown and described. 